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Billy & Billie centers on two young adults as they fall in love. They face the usual barrage of attention from their friends and family, and the normal anxieties that come at the start of a new relationship-all further complicated by the fact that they're stepbrother and sister.
Stepsiblings, Billy and Billie, reunite after many years apart and sleep together. The next morning they face the inevitable question: can they actually have a real relationship together?
After a close call where family members walk in on them sleeping, Billy and Billie decide to put their relationship on hold. Billy bounces back quickly but Billie has a harder time of it.
A chance run-in at a restaurant with Billie complicates Billy's work and personal relationships.
Billy and Billie try to keep their romantic relationship under wraps while visiting their parent's house over Halloween. A late night encounter with their half-brother, however, puts their private union in jeopardy.
Billy makes a public declaration of his "like" for Billie and Billie interviews to become an illustrator at Chisel.
Billy and Billie work contentedly together at Chisel. While Billie out for lunch, she runs into her father having a "business lunch" but his actions make Billie very suspicious. That evening, Keith sees Billy and Billie kissing in the park.
After their mother has a barely controlled freak out about their relationship, Billy and Billie both have a strange day that tests their loyalty to each other.
Billie spends a long day getting advice about life and love. Billy is asked to take time off from work and he takes refuge with a sexy waitress from a local diner.
Billie bounces back by beginning a dalliance with a TV star and continues to enjoy success at work, but her world is soon turned upside down once again.
Billy and Billie both arrive at the family home for Thanksgiving, despite Billie barely being able to contain her rage at her step-father. A family football game on the lawn leads to a drunken confrontation and an exposure of a secret.
